2006ApJ...645.1043K


C.D.S. - SIMBAD4 rel 1.7 - 2020.01.19CET19:48:23

2006ApJ...645.1043K - Astrophys. J., 645, 1043-1053 (2006/July-2)

On the origin of the Local Group's peculiar velocity.

KOCEVSKI D.D. and EBELING H.

Abstract (from CDS):

We aim to settle the debate regarding the fraction of the Local Group's peculiar velocity that is induced by structures beyond the Great Attractor by calculating the dipole anisotropy of the largest, all-sky, truly X-ray-selected cluster sample compiled to date. The sample is the combination of the REFLEX catalog in the southern hemisphere, the eBCS sample in the north, and the CIZA survey in the Galactic plane. The composite REFLEX+eBCS+CIZA sample overcomes many of the problems inherent to previous galaxy and cluster catalogs that limited their effectiveness in determining the origin of the Local Group's motion. From the dipole anisotropy present in the cluster distribution, we determine that 44% of the Local Group's peculiar velocity is due to infall into the Great Attractor region, while 56% is in the form of a large-scale flow induced by more distant overdensities between 130 and 180 h–1 Mpc away. In agreement with previous analyses, we find that the Shapley supercluster is the single overdensity most responsible for the increase in the dipole amplitude beyond 130 h–1 Mpc, generating 30.4% of the large-scale contribution. We find that a significant portion of the remainder is due to numerous groupings and loose associations of clusters at roughly the same distance as the Shapley region. We also note the presence of a significant underdensity of clusters in the northern hemisphere roughly 150 h–1 Mpc away and suggest that the large-scale anisotropy observed in the cluster distribution near this distance may have as much to do with the presence of large overdensities in the south as it does with the lack of superclusters in the north.

Abstract Copyright:

Journal keyword(s): Cosmology: Cosmic Microwave Background - Galaxies: Clusters: General - Cosmology: Large-Scale Structure of Universe - X-Rays: Galaxies: Clusters

CDS comments: Parag. 4.1 : Clusters C1410 and C1652 are respectively CIZA J1410.4-4246 and CIZA J1653.0-5943, C1821 not identified

Simbad objects: 25

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Number of rows : 25

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME PSC-CET SUPERCL SCG 00 33 -21.0           ~ 59 2
2 NAME Per-Peg SCG 02 26 +42.0           ~ 5 0
3 NAME HOR-RET SUPERCL SCG 03 16 -48.0           ~ 57 3
4 ACO 3128 ClG 03 30 34.6 -52 33 12           ~ 164 3
5 NAME LEP SUPERCL SCG 05 54.4 -28 05           ~ 16 0
6 ACO 3380 ClG 06 06 57 -49 29.5           ~ 17 2
7 ACO 3391 ClG 06 26 15.4 -53 40 52           ~ 165 1
8 ACO 3395 ClG 06 27 31.1 -54 23 58           ~ 172 0
9 NAME Great Attractor SCG 10 32 -46.0           ~ 447 0
10 NAME Vir I ClG 12 26 32.1 +12 43 24   10.00 8.49     ~ 5695 0
11 NAME LOCAL SUPERCL SCG 12 31 +12.4           ~ 443 0
12 ACO 3526 ClG 12 48 51.8 -41 18 21           ~ 961 2
13 NAME SHAPLEY-CENTAURUS CL SCG 13 06.0 -33 04           ~ 481 0
14 NAME HYA-CEN SUPERCL SCG 13 14 -33.3           ~ 128 0
15 1RXS J132441.9-573650 ClG 13 24 43.2 -57 36 52           ~ 21 1
16 2MAXI J1409-428 ClG 14 10 28.5 -42 46 37           ~ 9 0
17 NAME HERCULES SUPERCL SCG 15 47 +18.2           ~ 137 1
18 ACO 3627 ClG 16 14 22.5 -60 52 07           ~ 246 2
19 NAME Triangulum Australis Cluster ClG 16 38 16.1 -64 20 50           ~ 107 0
20 CIZA J1653.0-5943 ClG 16 53 00.8 -59 43 59           ~ 13 0
21 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11155 0
22 ACO 3651 ClG 19 52 10.9 -55 05 16           ~ 56 0
23 ACO 3667 ClG 20 12 33.68 -56 50 26.3           ~ 557 1
24 ACO 3716 ClG 20 51 16.7 -52 41 43           ~ 104 1
25 NAME Local Group GrG ~ ~           ~ 6752 0

    Equat.    Gal    SGal    Ecl

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2020.01.19-19:48:23

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